Scarborough subway extension tunnelling stalled near Highway 401 for months

The tunnel-boring machine for the Scarborough subway extension in Toronto has been stalled since September due to unexpected soil conditions, with maintenance work ongoing to address the issue, affecting the project’s timeline. Metrolinx officials have not provided specific updates on the situation, despite previous promises of a public tracker for the TBM’s progress, as work continues on other project elements like piling, headwalls, and emergency exit structures. The extension is still expected to open in 2030.

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